gpio: hlwd: Implement edge trigger emulation
Like the Spreadtrum EIC driver[1], this driver needs to emulate edge triggered interrupts to support the generic gpio-keys driver. [1]: https://www.spinics.net/lists/kernel/msg2764576.htmlSigned-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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